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09015 Study on Causes of Premature Disbonding in Epoxy/Urethane Coating System for Ships and Offshore Structures

Picture for 09015 Study on Causes of Premature Disbonding in Epoxy/Urethane Coating System for Ships and Offshor
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Product Number: 51300-09015-SG
ISBN: 09015 2009 CP
Author: Chung Seo Park, Mong Kyu Chung, Sung Mo Son,Chil S. Shin, E. S. Chung, H.I. Lee and Kwang Ki Baek
Publication Date: 2009
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Epoxy/urethane coating systems are widely used for weather parts of ships and offshore structures due to its excellent resistance to UV radiation as well as corrosion protection. Recently, epoxy/epoxy coating systems or epoxy/urethane coating systems have experienced lots of premature coating failure such as intercoat adhesion failure during winter and spring seasons in Korea. In this work, the root causes of premature coating failure were investigated using pH test and Fourier transform infrared spectroscopy (FT-IR) for several failed epoxy/urethane coating systems. We found that coating failure was attributed to the amine blush and urea formation by the reaction of isocyanate(- NCO) with moisture and free amine. The premature coating failure have been successfully controlled by the use of amine adduct or amide adduct hardener and the proper control of atmosphere for coating application in the winter and spring seasons.

Keywords: Intercoat adhesion failure, amine blush, FT-IR, epoxy/urethane coating system.
Epoxy/urethane coating systems are widely used for weather parts of ships and offshore structures due to its excellent resistance to UV radiation as well as corrosion protection. Recently, epoxy/epoxy coating systems or epoxy/urethane coating systems have experienced lots of premature coating failure such as intercoat adhesion failure during winter and spring seasons in Korea. In this work, the root causes of premature coating failure were investigated using pH test and Fourier transform infrared spectroscopy (FT-IR) for several failed epoxy/urethane coating systems. We found that coating failure was attributed to the amine blush and urea formation by the reaction of isocyanate(- NCO) with moisture and free amine. The premature coating failure have been successfully controlled by the use of amine adduct or amide adduct hardener and the proper control of atmosphere for coating application in the winter and spring seasons.

Keywords: Intercoat adhesion failure, amine blush, FT-IR, epoxy/urethane coating system.
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